Fahim, M. ., M. . Sohail, M. Sajjad Khan, F. U. . Khan, S. . Ur Rashid, and S. . Akhter. “Frequency of Bleeding Duodenal Ulcer in Patients Presenting With Upper Gastrointestinal Bleeding: Frequency of Duodenal Ulcer in Patients With Gastrointestinal Bleeding”. Pakistan Journal of Health Sciences, vol. 3, no. 06, Nov. 2022, pp. 88-92, doi:10.54393/pjhs.v3i06.308.